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There is a severe bug somewhere in the code. When copying a file with a filename of 24 characters length the teensy hangs. This happens with the blinky example on github, i reported this issue on github.

After some reading and fiddling i found this solution: I changed in usb_desc.h following line when "MTP_EVENT_ENDPOINT" is defined as 4: // #define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_ONLY #define ENDPOINT4_CONFIG ENDPOINT_TRANSMIT_AND_RECEIVE uint32_t eventID = 1; void...

Great work! Is there a way to signal the usb host that an object on the sd card was added, deleted or renamed? I know the mtp specification mentions events to do this, but i have no idea how to implement this. best regards, Thorvard